FMCOMB is a standard SAP Table which is used to store Define Combined Documents data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The FMCOMB table consists of various fields, each holding specific information or linking keys about Define Combined Documents data available in SAP. These include VALUE_TYPE (Combined Document), DOC_TYPE (Document Type for Combined Docs), COMB (Combined Document Predecessors)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .